(a) You detect a sound level of 97 dB when you are 3m from a

(a) You detect a sound level of 97 dB when you are 3m from a

(a)
You detect a sound level of 97 dB when you are 3m
from a sound source. Calculate the power of the
source. Assume it emits sound in
all directions uniformly.  
(b)
How far do you need to be from the source
so that you can barely hear any sound?
(c)  How much energy goes into your ear in 4 seconds
when you are 2 m from the source. Assume that the
radius of the opening into your ear is 0.4 cm.
(d) Periodic waves on the sea move at a speed of 4 m/s.
A boat floating on the sea takes 2.5 seconds to move
from its highest point to its lowest point.  Calculate the distance between two adjacent crests (high points
of the wave). 

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